I have a Simpson Carbon Devil Ray Helmet that I got this spring. The helmet is basically a smooth sphere with a couple of gentle circular ridges arranged around the top. Photo below.
The problem is that it develops enough lift at its rear edge that at high speeds it will pivot forward (down) over my eyes! I never had this problem with the Simpson Voyager. Nothing has changed in the cockpit, and the helmet fits tightly.
I tried to make a wicker-bill type spoiler for the top similar to those sold for the Bell helmets. At first it was too tall and drove my head down and back into the headrest. Trimming it gradually in stages got it to where it pushed my head back only slightly and seemed to prevent the pivot-over-the eyes problem.
Then, during the race at WG last weekend, it started pivoting down over my eyes again.
My next try will be to try to attach a PVC duck-tail spoiler to the top rear.
Anyone have any other solutions or suggestions to the lift/pivoting problem?
Thanks,